EP1756506B1 - Apparatus for cooling a hot gas - Google Patents

Apparatus for cooling a hot gas Download PDF

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Publication number
EP1756506B1
EP1756506B1 EP05742985A EP05742985A EP1756506B1 EP 1756506 B1 EP1756506 B1 EP 1756506B1 EP 05742985 A EP05742985 A EP 05742985A EP 05742985 A EP05742985 A EP 05742985A EP 1756506 B1 EP1756506 B1 EP 1756506B1
Authority
EP
European Patent Office
Prior art keywords
support plate
pipes
thermal shield
tube
coolant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05742985A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1756506A1 (en
Inventor
Tecksoon Lau
Tycho Agien Van Der Plas
Edwin Bernardus Wilhelmus Gerardus Voeten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to PL05742985T priority Critical patent/PL1756506T3/pl
Priority to EP05742985A priority patent/EP1756506B1/en
Publication of EP1756506A1 publication Critical patent/EP1756506A1/en
Application granted granted Critical
Publication of EP1756506B1 publication Critical patent/EP1756506B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0229—Double end plates; Single end plates with hollow spaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
    • B01J2219/0009—Coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00051—Controlling the temperature
    • B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
    • B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
    • B01J2219/00092—Tubes

Definitions

  • the invention is directed to an apparatus for cooling a hot gaseous medium by indirect heat exchange with a liquid coolant medium.
  • Such heat exchange devices are used on a large scale in many branches of industry, e.g. in the petroleum industry for cooling products obtained from hydrocrackers and reactors for partial oxidation of (hydro)carbon-containing fuels such as natural gas, oil, coal and the like.
  • the heat exchange takes place by passing the hot gasses through a pipe and contacting the exterior of the pipe with the coolant medium.
  • the coolant medium is water steam can advantageously be produced as a by-product of the heat exchange process in the apparatus.
  • the hot gases are passed through tubes which are cooled with a cooling medium on the outside, the walls of the tubes acquire a high temperature owing to transfer of heat from the hot gases to the tube metal which heat is further transmitted to the cooling medium.
  • An example of a hot gaseous medium to be cooled is the hot synthesis gas produced by partial oxidation of (hydro)carbon-containing fuel is generally cooled in a heat exchanger located next to the gasifier thereby producing high pressure steam.
  • a critical area is the gas inlet of the heat exchanger where the hot synthesis gas enters the pipes of the heat exchanger apparatus.
  • the wall thickness of the inlet area is to be minimised but should be thick enough to ensure mechanical integrity based on pressure and thermal loads.
  • the gas velocity at the inlet area should be sufficiently high to prevent fouling (say 12 m/s) but on the other hand low enough to ensure sufficiently low gasside heat transfer coefficients. In particular, obtaining an optimum between fouling and velocity is desirable.
  • US-A-3610329 describes a heat exchanger for cooling the hot gasses from a gasification process.
  • the vertical oriented inlet section is protected against excessive heat by bricks located between the support plate and the space from where the hot gas flows.
  • the tubes through which the hot gas flows transverse through the bricks.
  • the inlet section of the tubes is cooled by using a coolant having a low temperature.
  • the used coolant is discharged from the inlet section by means of a separate conduit.
  • a disadvantage of this design is the use of the bricks which in use can fall down.
  • EP-A-290812 describes a heat exchanger vessel having an inlet section wherein the pipes are mounted at their upstream ends in a support plate.
  • the coolant used to cool the inlet section is subsequently passed along the downstream end of the tubes via a second tube surrounding the entire length of the tubes.
  • These jacket type of external tubes have openings to allow coolant to be discharged into the space surrounding the tubes and be discharged from the vessel via a single outlet opening.
  • EP-A-774103 describes an apparatus having an inlet section wherein the pipes are mounted at their upstream ends in a thermal shield and a support plate. Between the thermal shield and the support plate a space is present. As in the above references an annular space is present around the pipes as they pass the support plate. To said annular space coolant medium is added such that it passes the support plate in a direction counter-current to the hot gas flowing in the pipes. Additionally a skirt is present to guide the coolant medium along the exterior of the pipes into the space between thermal shield and support plate. The coolant is discharged at a position near the thermal shield and discharged via openings in the support plate to the main coolant compartment.
  • a disadvantage of the above prior art apparatuses is that the cooling of the upstream end of the pipes and the thermal shield is not sufficient.
  • the present invention involves a design that aims to overcome said disadvantage.
  • Apparatus (1) for cooling a hot gaseous medium comprising: a vessel (2) wherein a bundle (3) of a number of pipes (4) are disposed in a coolant medium compartment (5) and wherein in use a liquid coolant medium (6) flows around the pipe bundle (3);
  • FIG. 1 illustrates part of the heat exchanger apparatus (1) according the invention for cooling a hot gaseous medium. Also shown is the lower end of a partial oxidation or gasification reactor (20) in which a hot synthesis gas is produced which is suitably cooled by apparatus (1).
  • the apparatus (1) comprises a vessel (2) wherein a bundle (3) of a number of pipes (4) are disposed in a coolant medium compartment (5).
  • the number of pipes in the apparatus is suitably at least 4.
  • the maximum number of pipes will be determined by the required cooling capacity per apparatus and can be up to and including 24, suitably between and including 6 and 20.
  • the pipe bundle can be arranged as a set of straight parallel oriented pipes, wherein for example the at the gas outlet ends of the pipes are arranged in a second tube plate shield fluidly connected to a common gas outlet of the heat exchanger apparatus.
  • Figure 1 also shows a gas outlet end (17) of the pipes (4).
  • a liquid coolant medium (6) will flow freely around the pipe bundle (3).
  • a suitable cooling medium is water.
  • water will evaporate to produce steam.
  • water also other cooling media can be used in the below embodiments.
  • the means to discharge steam at the top of the vessel (2) and optional means to add fresh coolant medium, preferably water, directly to the coolant medium compartment (5) as will present in the apparatus according to the invention are not shown in Figure 1 . It is however advantageous that substantially all of the water, suitably more than 90 wt% and preferably 100 % of the fresh cooling water is provided to cooling medium compartment (5) via means (10), front space (9) and annular space (12).
  • FIG. 1 it is shown that the pipes (4) are mounted at their upstream ends in a thermal shield (7). Just downstream in the direction of the hot gas flow the pipes (4) further extend through a support plate (8).
  • the thermal shield (7) is mounted at a distance from the support plate (8) determining a front space (9) between said thermal shield (7) and said support plate (8) in the vessel (2).
  • the support plate separates the front space (9) from the coolant medium compartment (5).
  • This front space should be large enough for the water added by the means (10) to sufficiently cool the thermal shield and the upstream ends of the pipes. This space should however not be too large in order to avoid water to evaporate in this space. Examples of suitable dimensions are disclosed in the above referred to US-A-5671807 , US-A-4245696 and EP-A-774103 .
  • the thermal shield and support plate are preferably oriented vertically as shown in Figure 1 . This orientation allows for connecting the gasification reactor (20) and the heat exchanger apparatus (1) more efficiently. The efficiency is achieved in that the surface area, which requires refractory lining, is minimized.
  • FIG. 10 shows a more detailed view of the inlet section of Figure 1 .
  • water is added to the front space (9).
  • Preferably means (10) is a conduit for transport of water which runs from a water reservoir exterior to the vessel via the support plate (8) to a coolant medium distributor (19) which has multiple outlet openings in the front space (9).
  • the outlet openings (18) are preferably distributed between the various pipe inlet openings with a preferred outlet flow direction towards the thermal shield to achieve optimal cooling of said plate. If the volume of water added by means (10) is, in use, not enough to compensate for the volume of water, which evaporates in the main coolant medium compartment (5) an additional means to add water to the main coolant compartment (5) is suitably present.
  • FIG 2 shows that the openings (11) in the support plate (8) are larger than the pipes (4) defining an annular space (12) between pipe and support plate.
  • liquid coolant can flow co-current with the hot gaseous medium in the pipes (4) from the front space (9) to the cooling medium compartment (5).
  • the co-current flow of coolant is advantageous because a more efficient cooling of the thermal shield (7) and the inlet end of the pipes (4) is achieved than when the coolant would flow counter-current as disclosed in EP-A-774103 .
  • the cooling of these critical parts is further enhanced by positioning the skirt type extension (13) around the pipe (4) in the front space (9).
  • the skirt (13) is fixed to the support plate (8).
  • the skirt type extension has an opening (14) for inlet of cooling medium.
  • the opening (14) is preferably a full circular opening as shown in Figure 2 .
  • the opening (14) is at the thermal shield (7) as shown in Figure 1 .
  • the skirt is rotation-symmetrical, e.g. a sleeve as shown in Figure 2 .
  • the inlet opening of the pipes (4) at the thermal shield (7) are conical shaped as shown in Figure 1 and 2 .
  • the angle, alpha, between the inner inlet surface of the tube (4) of the frusto conical part of said tube and the axis of the tube is preferably smaller than 30 °, more preferably between 5 and 25 ° and most preferably between 10 and 25 °.
  • the corner between the inner conical shaped surface of the tube (4) and the surface of the thermal shield is preferably smooth such to avoid turbulence of the hot gas passing that point.
  • the shape of the skirt type extension (13) runs parallel with the shape of the inlet end of the pipes (4).
  • the shape of the skirt type extension will therefore preferably be composed of a tubular part fixed to a frusto conical part as shown in Figure 2 . More preferably the length of the conical shaped inlet is substantially the same as the depth of the front space.
  • the skirt type extension (13) will then only have a frusto conical shape.
  • the skirt extends a length d1 from the point where the skirt starts to expand in diameter.
  • This length d1 is between 30 and 70% of the length d along the conical shaped inlet part as measured from the point in the tube where the conical part starts to expand in diameter.
  • the length d is the total length of the conical part as measured along the surface of the tube and in the direction of the gas flow.
  • Figure 2 also shows a spacer ring (15) to fix the pipe (4) in the support plate (8).
  • the spacer ring (15) is provided with an opening (16) through which water flowing from the front space can flow to the coolant medium compartment (5).
  • Said ring (15) may be positioned at any location in the annular space (12) as illustrated in US-A-5671807 and US-A-4245696 .
  • the spacer ring (15) is positioned in opening (11) at the side of the support plate (8) facing the coolant medium compartment (5).
  • Figure 3 is as Figure 2 .
  • the skirt extends through support plate (8) and eliminates the need for an additional support ring as in Figure 2 .
  • This skirt type extension (20) is closed at its end facing the cooling medium compartment (5) except for one or more openings (22) for allowing water to flow from annular space (12) to the cooling medium compartment (5).
  • this skirt type extension (20) fixes the tube (4) to the support plate (8) by means of welding (21) between the skirt type extension (20) and the support plate (8) and the skirt type extension (20) and the tube (4) as illustrated in Figure 3 .
  • the invention is also directed to the use of an apparatus as described above for cooling hot gasses having a temperature of between 700 and 1600 °C, preferably between 1000 and 1600 °C against water as coolant medium to prepare steam having a pressure of up to 15 MPa.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP05742985A 2004-05-25 2005-05-03 Apparatus for cooling a hot gas Not-in-force EP1756506B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL05742985T PL1756506T3 (pl) 2004-05-25 2005-05-03 Urządzenie do chłodzenia gorącego gazu
EP05742985A EP1756506B1 (en) 2004-05-25 2005-05-03 Apparatus for cooling a hot gas

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04102286 2004-05-25
PCT/EP2005/052023 WO2005116560A1 (en) 2004-05-25 2005-05-03 Apparatus for cooling a hot gas
EP05742985A EP1756506B1 (en) 2004-05-25 2005-05-03 Apparatus for cooling a hot gas

Publications (2)

Publication Number Publication Date
EP1756506A1 EP1756506A1 (en) 2007-02-28
EP1756506B1 true EP1756506B1 (en) 2009-08-19

Family

ID=34929128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05742985A Not-in-force EP1756506B1 (en) 2004-05-25 2005-05-03 Apparatus for cooling a hot gas

Country Status (11)

Country Link
US (1) US8186423B2 (ja)
EP (1) EP1756506B1 (ja)
JP (1) JP2008500506A (ja)
CN (1) CN101389920B (ja)
AT (1) ATE440255T1 (ja)
CA (1) CA2567768C (ja)
DE (1) DE602005016107D1 (ja)
ES (1) ES2331082T3 (ja)
PL (1) PL1756506T3 (ja)
TW (1) TW200607977A (ja)
WO (1) WO2005116560A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3899396B1 (en) 2018-12-20 2022-09-14 Hexsol Italy Srl Heat exchanger having an end junction

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2007235916B2 (en) 2006-04-12 2010-06-17 Shell Internationale Research Maatschappij B.V. Apparatus and process for cooling hot gas
US11029093B2 (en) * 2017-03-30 2021-06-08 Baltimore Aircoil Company, Inc. Cooling tower with direct and indirect heat exchanger
EP4028488A2 (en) 2019-09-11 2022-07-20 Michiel Cramwinckel Process to convert a waste polymer product to a gaseous product

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3899396B1 (en) 2018-12-20 2022-09-14 Hexsol Italy Srl Heat exchanger having an end junction

Also Published As

Publication number Publication date
TW200607977A (en) 2006-03-01
CA2567768A1 (en) 2005-12-08
DE602005016107D1 (de) 2009-10-01
CN101389920A (zh) 2009-03-18
EP1756506A1 (en) 2007-02-28
US20090236084A1 (en) 2009-09-24
ATE440255T1 (de) 2009-09-15
CA2567768C (en) 2012-04-03
WO2005116560A1 (en) 2005-12-08
ES2331082T3 (es) 2009-12-21
JP2008500506A (ja) 2008-01-10
PL1756506T3 (pl) 2010-01-29
CN101389920B (zh) 2010-11-03
US8186423B2 (en) 2012-05-29

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